645232466 has 4 divisors (see below), whose sum is σ = 967848702. Its totient is φ = 322616232.

The previous prime is 645232463. The next prime is 645232499. The reversal of 645232466 is 664232546.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 664232546 = 2 ⋅332116273.

It can be written as a sum of positive squares in only one way, i.e., 560316241 + 84916225 = 23671^2 + 9215^2 .

It is not an unprimeable number, because it can be changed into a prime (645232463) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 161308115 + ... + 161308118.

Almost surely, 2^645232466 is an apocalyptic number.

645232466 is a deficient number, since it is larger than the sum of its proper divisors (322616236).

645232466 is a wasteful number, since it uses less digits than its factorization.

645232466 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 322616235.

The product of its digits is 207360, while the sum is 38.

The square root of 645232466 is about 25401.4264560083. The cubic root of 645232466 is about 864.1160475483.

The spelling of 645232466 in words is "six hundred forty-five million, two hundred thirty-two thousand, four hundred sixty-six".